The Rigveda, one of the four Vedas, contains hymns and verses that mention celestial bodies and astronomical phenomena.

Jantar Mantar is a collection of astronomical instruments located in various cities across India, including Delhi, Jaipur, Ujjain, and Varanasi.

Varahamihira, a 6th-century astronomer and astrologer, is known for his work on the zodiac and the system of 12 zodiac signs.

The quadrant, also known as the Yantra-raj-yantra, was an astronomical instrument used in ancient India to measure the altitude of celestial bodies.

Aryabhata, a 5th-century astronomer and mathematician, proposed the heliocentric model of the solar system in his work, the Aryabhatiya.

The sundial, also known as the gnomon, was an astronomical instrument used in ancient India to measure time.

Brahmagupta, a 7th-century astronomer and mathematician, developed the concept of the precession of the equinoxes.

The armillary sphere, also known as the gola yantra, was an astronomical instrument used in ancient India to measure the positions of celestial bodies.

Varahamihira, a 6th-century astronomer and astrologer, is credited with developing the concept of the nine planets, including Rahu and Ketu.

The astrolabe, also known as the yantra, was an astronomical instrument used in ancient India to measure the distance between celestial bodies.

Aryabhata, a 5th-century astronomer and mathematician, developed the concept of the Earth's rotation on its axis.

The sundial, also known as the gnomon, was an astronomical instrument used in ancient India to measure the time of day.

Aryabhata, a 5th-century astronomer and mathematician, developed the concept of the Earth's revolution around the Sun.

The quadrant, also known as the Yantra-raj-yantra, was an astronomical instrument used in ancient India to measure the altitude of celestial bodies.